ci: fixes pipeline failures in docs

[jpower432]

Types of changes

• Hot fix (emergency fix and release)
• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Documentation (change which affects the documentation site)
• Breaking change (fix or feature that would cause existing functionality to change)
• Release (develop -> main)

Quality assurance (all should be covered).

• My code follows the code style of this project.
• Documentation for my change is up to date?
• My PR meets testing requirements.
• All new and existing tests passed.
• All commits are signed-off.

Summary

This PR fixes the two pipeline failures:

• Docs update
  • GITHUB_REF is not available through the env context. Switching to github.event.ref.
• Dead link on the python-semantic-release docs site

Adds (If this add does not seem super valuable, I can remove from this PR)
- A check in python test workflow where the mike-version script is checked against the environment.

How To Test

The mike-version job should pass

act push -e test-event.json -W .github/workflows/docs-update.yml -j mike-version

test-event.json contains

{
  "ref": "refs/tags/v3.6.0"
}

Key links:

• Sonar coverage

Before you merge

• Ensure it is a 'squash commit' if not a release.
• Ensure CI is currently passing
• Check sonar. If you are working for a fork a maintainer will reach out, if required.

[butler54]

LGTM

[vikas-agarwal76]

LGTM